Impersonate user

With the new security rehash that is coming (and even without it), it would be nice for an "impersonate" button next to a username so that an administrator can login as a user in order to see Hudu as that user would in order to test security.
This can incorporate or be a better version of what I asked here - https://hudu.canny.io/feature-requests/p/view-another-users-personal-passwords